Blood flows through a major artery at $0\mathrm{.}90\frac{m}{s}$ over a distance of $0\mathrm{.}50m,$ then at $0\mathrm{.}70\frac{m}{s}$ for another $0\mathrm{.}50m$ through a smaller artery.Is the average speed of the blood $0\mathrm{.}80\frac{m}{s},$ greater than $0\mathrm{.}80\frac{m}{s},$ or less than $0\mathrm{.}80\frac{m}{s}?0\mathrm{.}80\frac{m}{s}$ Less than $0\mathrm{.}80\frac{m}{s}$ Greater than $0\mathrm{.}80\frac{m}{s}$